Bumper looks pretty smashed, that'll be a new one you'll need. Same for the wing really, it's repairable by a body shop, but for the cost of it you might as well source a second hand one.
As for the inner arch, I got one from a citroen main dealer for £15 brand new (the same arch as yours)
Thats what I'd do anyway, although I'm at the stage where i can't be bothered with hassle
Edit: if they're only scratches on the wheel arch, and there are no dents and its not distorted etc, you could always re spray it yourself. You'll be able to source the correct paint in a 50ml tin from citroen, and it comes with a 50ml can of laquer too.
It's difficult judging only from the one pic though!